.header-nav{
    width: 100%;
    height: 80px;
    border-bottom: 1px solid #999;
    margin-bottom: 10px;
    line-height: 80px;
    display: flex;
}
.header-nav nav{
    margin: 0 auto;
    width: auto;
    display: flex
}
.header-nav nav>a{
    padding: 0px 15px;
    display: inline-block;
    height: 80px;
    font-style: normal;
    text-decoration: none;
    color: #424242;
    font-size: 18px;
    font-weight: 500;
}
.header-nav nav>a.router-link-exact-active{
    color: #f40;
}